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    <ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../services.html">Services</a></li><li><a href="index.html">inflections</a></li><li><a href="index.html#2">Chapter 2: Simple Inflections</a></li><li><b>Past Participles</b></li></ul></div>
<p class="purpose">To inflect present into past participles.</p>

<ul class="toc"><li><a href="2-pp.html#SP1">&#167;1. Constructing past participles</a></li><li><a href="2-pp.html#SP2">&#167;2. The pasturising trie</a></li></ul><hr class="tocbar">

<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>&#167;1. Constructing past participles.</b>For example, "turning away" to "turned away".
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="function-syntax">PastParticiples::pasturise_wording</span><span class="plain-syntax">(</span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pasturised</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">TEMPORARY_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">feed_t</span><span class="plain-syntax"> </span><span class="identifier-syntax">id</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Feeds::begin</span><span class="plain-syntax">();</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOOP_THROUGH_WORDING</span><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">, </span><span class="string-syntax">"%W"</span><span class="plain-syntax">, </span><span class="identifier-syntax">Wordings::one_word</span><span class="plain-syntax">(</span><span class="identifier-syntax">i</span><span class="plain-syntax">));</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">Str::get_first_char</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">) == </span><span class="character-syntax">'\"'</span><span class="plain-syntax">) </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">pasturised</span><span class="plain-syntax">, </span><span class="string-syntax">"some-long-text"</span><span class="plain-syntax">);</span>
<span class="plain-syntax">        </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
<span class="plain-syntax">            </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><a href="2-pp.html#SP2" class="function-link"><span class="function-syntax">PastParticiples::pasturise_text</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">pasturised</span><span class="plain-syntax">, </span><span class="identifier-syntax">from</span><span class="plain-syntax">)) {</span>
<span class="plain-syntax">                </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> &gt; </span><span class="identifier-syntax">Wordings::first_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) </span><span class="identifier-syntax">Feeds::feed_wording</span><span class="plain-syntax">(</span><span class="identifier-syntax">Wordings::up_to</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">-1));</span>
<span class="plain-syntax">                </span><span class="identifier-syntax">Feeds::feed_text</span><span class="plain-syntax">(</span><span class="identifier-syntax">pasturised</span><span class="plain-syntax">);</span>
<span class="plain-syntax">                </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">i</span><span class="plain-syntax"> &lt; </span><span class="identifier-syntax">Wordings::last_wn</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">)) </span><span class="identifier-syntax">Feeds::feed_wording</span><span class="plain-syntax">(</span><span class="identifier-syntax">Wordings::from</span><span class="plain-syntax">(</span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">i</span><span class="plain-syntax">+1));</span>
<span class="plain-syntax">                </span><span class="reserved-syntax">break</span><span class="plain-syntax">;</span>
<span class="plain-syntax">            }</span>
<span class="plain-syntax">        }</span>
<span class="plain-syntax">    }</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">wording</span><span class="plain-syntax"> </span><span class="identifier-syntax">PLW</span><span class="plain-syntax"> = </span><span class="identifier-syntax">Feeds::end</span><span class="plain-syntax">(</span><span class="identifier-syntax">id</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">LOGIF</span><span class="plain-syntax">(</span><span class="identifier-syntax">CONSTRUCTED_PAST_PARTICIPLES</span><span class="plain-syntax">, </span><span class="string-syntax">"[Past participle of %W is %W]\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">W</span><span class="plain-syntax">, </span><span class="identifier-syntax">PLW</span><span class="plain-syntax">);</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">from</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">DISCARD_TEXT</span><span class="plain-syntax">(</span><span class="identifier-syntax">pasturised</span><span class="plain-syntax">)</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">PLW</span><span class="plain-syntax">;</span>
<span class="plain-syntax">}</span>
</pre>
<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>&#167;2. The pasturising trie.</b>This is the process of turning a present participle, like "turning", to
a past participle, like "turned". Note that it returns <span class="extract"><span class="extract-syntax">NULL</span></span> if it fails
to recognise the word in question as a present participle; this is needed
above. It expects only a single word.
</p>

<pre class="displayed-code all-displayed-code code-font">
<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">PastParticiples::pasturise_text</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">PastParticiples::pasturise_text</span></span>:<br/><a href="2-pp.html#SP1">&#167;1</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">from</span><span class="plain-syntax">) {</span>
<span class="plain-syntax">    </span><span class="identifier-syntax">match_avinue</span><span class="plain-syntax"> *</span><span class="identifier-syntax">past_trie</span><span class="plain-syntax"> =</span>
<span class="plain-syntax">        </span><span class="identifier-syntax">PreformUtilities::define_trie</span><span class="plain-syntax">(</span><span class="function-syntax">&lt;pasturise-participle&gt;</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRIE_START</span><span class="plain-syntax">,</span>
<span class="plain-syntax">            </span><a href="4-dl.html#SP1" class="function-link"><span class="function-syntax">DefaultLanguage::get</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">NULL</span><span class="plain-syntax">));</span>
<span class="plain-syntax">    </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><a href="2-tai.html#SP1" class="function-link"><span class="function-syntax">Inflect::suffix</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">OUT</span><span class="plain-syntax">, </span><span class="identifier-syntax">past_trie</span><span class="plain-syntax">, </span><span class="identifier-syntax">from</span><span class="plain-syntax">);</span>
<span class="plain-syntax">}</span>
</pre>
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